Electrical writing apparatus.



D. P. P. GHADIALI.

13201111101111 WRITING APPARATUS.

APPLICATION FILED MAY 21, 1909.

983,703. 4 Patented Feb. 7, 1911.

UNITED STATES; PATENT OFFICE.

"nmsnan rnsrann FB AMJI Gunman,- or sum'r, INDIA.

ELECTRICAL WRITING APPARATUS.

To allwhomit may concern:

Be it known that I, DINSHAH Pns'rANJI FI/EAMJI GHADIALI, a Cltlzell of Great Britain; residing at the city of Surat, British,

India, have invented certain new and-useful Improvements in Electrical Writing Apparatus, of which the following is a specifications i This invention relates to pens generally, and particularly to that class inwhich high tension electric currents are employed for carbonizing the paper.

The principal'object of this invention is to provide a novel device of this character 1 whichwill prevent the tampering with ink written documents. Heretofore, when ink 'has been employed for writing purposes, the 3 said writing could be easily changed as desired, but with the vention the writing will be carbonized and perforated simultaneously in the paper and it will therefore be impossible to make any holder to close-thecircuit.v

rheostat R and mainsw itch changes whatsoever withdut immediate de-;

tection thereof.

Another object of the invention .is' to provide a device of this'characterwhich will be free from danger and which will make no mark except when the same is pressed upon the paper or other object. r p

A still further object of the-invention is to provide a construction in which a writing desk formsone contact with a circuit, and a pen the other contact thereof, the said pen I having a resilient point gaged with the or the like is which when enpaper for writing purposes depressed Withthese and other objects in view, the invention consists'in the construction'and novel combination of parts hereinafter fully described, illustrated in the accompanying drawings and ointed out in the claimsherewith appende it being understood that various -changes in the/form, proportion, size and minor details of construction within the scope ofthe claims, may be resorted to without departing from the spiritor sacrificing an of the advantages of the invention.

' n the drawing, the figure shows a View partly diagrammaticaland partlyin sec-,

tion of the various elements. and connections .of the entire device.

Referring to the drawing, it will be seen that my invention comprises an accumulator or other sourcepf electric energy A. A M are arranged Specification ofLetters Patent. Application filed Kay 21,

employment of my inwithin the pen-' lation within thetu Patented Feb. 7, 1911.

1909. Serial No. 497,562.

in circuit with one pole of the accumulator, the switch being preferably arranged intermediate of the two.

tion coil Z having primary connections P connected to the secondary terminals and is spark hereinafter described.

desk D which is provided with an insulatthe vacuum tube V. Extending from the accumulator A and the condenser PC is. a pair of wires'Y which are respectively connected to binding posts E' and B, arranged ,within the pen-holder N. This pen is preferably provided with a removable cap W to protect the said binding-posts B ajnd E. A

glass tube G containing an enlargement or bulb H" is arranged longitudinally within the pen-holder. Wires F and I are respectively arranged lon itudinally in spaced rethe latter wire being directly connected to the binding post E. A quantity-0f mercuryis arranged within the glass tube and is adapted when the pen in the bulb thereof. When the pen is raised, however, the mercury will run down the tube and form a metallic contact between the vspaced wires F and I, as will be readily seen. j A piston or needle 0 is'arra-n'ged at one end -to move longitudinally against the tension of a coil spring L which surrounds the inner end of said needle. When the said needle is forced inwardly, due tothe pressure exerted upon the pen-holder proper, it will close a circuit by contacting with a lu'g'K arranged in rear of thefsame. A wire connects the said lug K and the connection'B. a

I In-operation, the penis held vertically,

. The invention further comprises an inducand P, and secondary connections S and S, one of the primary connections being con-.

tion -while working. A condenser SC is adapted to intensify the caloric power of the *ing top U. This desk is preferably made of 'aluminum and is in circuit with one end of is in a horizontal positionto'be seated with-- The invention further comprises a writing I the mercury H closes the circuit between the wires F and I, therebyv bringing 'into circuit both the primary and secondary coils. The moment the needle 0 is pressed on the paper to write, the spring T is pushed back and the contacts L and K are brought together thereby completing the primary circuit.- In this manner,

the high tension sparks formed between the desk D and the needle 0, carbonize and perforate the paper placed on the said desk.

By theaid of the secondary condenser SC, the current is condensed so that the spark is given greater intensity of heat in order to better carbonize the paper. It will furthermore be seen that when the pen is temporarily raised from the paper between words, figures and the like, the release of pressure upon the needle 0 breaks the primary .Clf-

cuit. In this manner, a waste of electric energy is prevented, as the pen ceases to be effective while the o erator pauses from time to time. It will urthermore be seen that this arrangement prevents any unnecessary carbonization of the paper.

\Vhat I claim 1. An apparatus of the class described comprising a normall open circuit including a source of electrical energy, a writing desk connected to one pole of the said source of energy an forming one contact element of the circuit, and a pen having one end connected to the other pole of the saidsource ofenergy and the other end provided with a needle and forming the other contact element of the circuit.

2. An apparatus comprising a normally open circuit, including a source of electrical energy, an induction coil having primary and secondary terminals, a circuit'breaker, a condenser for the primary coil, a condenser for the secondary coil, a connection including a rheostat between one of the primary, terminals and one pole of the source of energy, a writing desk forming one contact element of the circuit connected with the secondary coil, and a pen forming the other contact element of the circuit and having connections respectively with the primary condenser and circuit breaker, and with the otherpole of the source of energy.

3. An apparatus of the class described, comprising a normally open circuit, including a source of electrical energy, an induction coil having primary and secondary terminals, a

circuit breaker, a condenser for the primary I coil, a condenser for the secondary coil, a connection including a rheostat between one of the primary terminals and one pole of the source of energy, a'writing desk forming one contact element-of the circuit connected with the secondary coil, a vacuum indicator arranged parallel with the secondary conmoves down the tube and denser and the said contact element, and a pen forming the other contact element of the circuit and having connections respectively with the primary condenser and circuit breaker, and with the other pole of the source of energy.

4. An apparatus of the class described, comprising the combination with a normally open circuit including a source of electrical energy, of a writing desk connected to one pole of the said source of energy and forming one contact element, and' a pen having one end connected to the other pole of the said source of energy and the other end provided with a needle and forming the other contact element, said pen having an open circuit connecting the needle and the first-mentioned end and means for closing the same upon certain positions of the pen.

5. An apparatus of the class described, comprising a normally open circuit including a source of electrical energy, a writing desk connected to one pole of the said source of energy and forming, one contact element of the circuit, and a pen connected to the other .pole of the said source of energy and formingthe other contact element of the circuit, the said en comprising a casing, a longitudinal tube formed-therein and provided with an enlargement adapted to receive mercury, spaced wires arranged lon itudinally within the tube and adapted to connected by the mercury upon certain positions of the pen, a contact lug arranged near the front 'end of the en, a wire connectin the latter and exten ing rearwardly, bin ing posts respectively connecting one of the first-mentioned wires and the last-mentioned wire, and a needle resiliently secured in the front end and adapted through pressure upon the needle to make contact with the saidlug.

('3. A pen of the class described, comprising a casing, 9. Ion itudinal tube formed therein andprovide with an enlargement adapted to receive mercury, zwircs arrange longitudinally within the tube ands aced apart at a' point away from the said eniingement, said wires being adapted to be connected by the mercury 'upon certain positions ofthe pen, acontact lug arranged near the front end of the en, a wire connecting the latter and extending rearwardly, binding posts respectively connecting one of the firstmentionedwires and the last-mentioned wire, and a needle resiliently secured in the front end and adapted through pressure upon the needle-to make contact with the said lug.

DINSHAH PESTANJI FRAMJI GHADIALI. Witnesses:

MANEK DINsHArr GHADIALI, GULAMALI M. ABDULALI. 

